The Landauer constant has hypotheses

The value $k_{\mathrm{B}}T\ln 2$ refers to an entropy decrease of one uniformly distributed classical bit under an appropriate thermal erasure specification. It is not a universal cost per syntactic bit, and it does not follow from a channel being non-injective. Side information, finite reservoirs, and non-cyclic resource consumption must be accounted for rather than hidden in the word “recycling.”